<?php
$controller = Zend_Controller_Front::getInstance()->getRequest()->getControllerName();
$html = array();
foreach($this->container as $container){
    $class = ($container->get('controller') == $controller) ? 'class="current"' : '';
    $html[] = '<li ' . $class . '><a href="' .$container->getHref(). '">' . $container->label . '</a></li>' ;
}
echo '<ul>' . implode(PHP_EOL, $html) . '</ul>';
?>